Is it safe to put color on a cracked Iphone?

I cracked the back of my Iphone 4S a couple weeks ago, and I was wondering if I could color the back of it so it looks cool and stuff? My mom said that it might not be a good idea, but I wanted to see if this was true

Why do you want to color it? The worst that could happen is it will smear.other than that there's nothing wrong.

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